package com.syt.eduservice.Listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.syt.eduservice.entity.EduSubject;
import com.syt.eduservice.entity.excel.SubjectData;
import com.syt.eduservice.service.EduSubjectService;
import com.syt.servicebase.exceptionHandler.MyException;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {
    //因为SubjectExcelListener不能交给Spring进行管理,需要自己new 不能注入其他对象
    //不能实现数据库操作
    public EduSubjectService  subjectService;

    public SubjectExcelListener() {}

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    //读取excel内容,一行一行读取
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if (subjectData == null){
            throw new MyException(20001,"文件数据为空");
        }
        //一行一行读取,每次读取有两个值,第一个值是一级分类,第二个值是二级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if (existOneSubject == null){ //没有相同的一级分类,进行添加
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName()); //设置一级分类名称
            subjectService.save(existOneSubject);
        }
        //添加二级分类
        //判断二级分类是否存在
        String pid=existOneSubject.getId(); //获取一级分类id值
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName(), pid);
        if (existTwoSubject == null){ //没有相同的一级分类,进行添加
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName()); //设置一级分类名称
            subjectService.save(existTwoSubject);
        }
    }
    //判断一级分类不呢个重复添加
    private EduSubject existOneSubject(EduSubjectService  subjectService,String name){
        QueryWrapper<EduSubject> wrapper =new QueryWrapper<>();
        wrapper.eq("title",name).eq("parent_id","0");
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }
    private EduSubject existTwoSubject(EduSubjectService  subjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper =new QueryWrapper<>();
        wrapper.eq("title",name).eq("parent_id",pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
